file upload in nested form with CPM needs dummy model

[Tom Eicher]

Hello,

I have an outer form, with a CPM for a business entity.
An inner form
Form<Void> uploadImageForm = new Form<>("UploadImageForm");

has a
FileUploadField uploadImageField =
  new FileUploadField("UploadImageField");

and when I submit the inner form, wicket tries to find
getters/setters for UploadImageField in my business entity,
which obviously are not there:

WicketRuntimeException: No get method defined for class: class 
XXXBusinessEntity expression: UploadImageField

I tried many things to work around this problem, including
Form<Void> uploadImageForm = new Form<>("UploadImageForm", null);
and
uploadImageField = new FileUploadField("UploadImageField", null);
and
setModel(null)
and some more, however the only way to really get rid of this
I found is:

FileUploadField uploadImageField = new 
FileUploadField("UploadImageField", new UploadFieldModel());

        static class UploadFieldModel implements IModel<List<FileUpload>> {
                List<FileUpload> f;
                @Override
                public List<FileUpload> getObject() {
                        return f;
                }
                @Override
                public void setObject(List<FileUpload> object) {
                        f=object;
                }
                @Override
                public void detach() {
                }
        }

That doesn't sound too reasonable, does it ?
I do not need or want the value to be put to any model, is there any
more sensible way to do this ? (wicket 6.8.0 - will update soon)

Cheers, Tom.

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